Speaker
Description
First Name: Juraj
Last Name: Lorincik
Email Address: lorincik@baeri.org
Affiliation: BAERI/LMSAL
All Authors: Juraj Lorincik, Hannah Collier, Vanessa Polito, Laura Hayes, William H. Ashfield IV, Nabil Freij
Abstract: Slipping motions of flare ribbon kernels and the formation of hard X-ray (HXR) footpoints are important observational signatures of magnetic reconnection. The spatio-temporal correspondence between the ribbon ultraviolet and HXR emission, both often quasi-periodic, is however largely unexplored. We focus on high-cadence IRIS and STIX observations of an M9.6-class flare from 2022 March 31. Non-thermal emission captured by STIX exhibited QPPs with periods of about 35 s, stemming from two stationary footpoint sources in the central flare region. Most STIX QPPs were correlated with intensity pulsations captured by the Slit Jaw Imager (SJI) of IRIS in portions of ribbons co-spatial with the HXR footpoints. The Si IV 1402.77 line spectra in one of these regions showed intensity, Doppler speed, and broadening pulsations partially overlapping with the HXR QPPs. Meanwhile, SJI also observed slipping kernel motions elsewhere in the ribbons whose timing, locations, and associated UV intensity variation were difficult to associate with HXR emission. Our analysis suggests prominent quasi-periodic non-thermal energy deposition into a specific loop system near the reconnection site, while the rate of the energy deposition to slipping kernels was likely lower. Our investigation provides a multi-faceted view of 3D magnetic reconnection and its energization of the lower solar flare atmosphere.